9945709 has 2 divisors, whose sum is σ = 9945710. Its totient is φ = 9945708.

The previous prime is 9945707. The next prime is 9945743. The reversal of 9945709 is 9075499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5336100 + 4609609 = 2310^2 + 2147^2 .

It is a cyclic number.

It is not a de Polignac number, because 9945709 - 2¹ = 9945707 is a prime.

Together with 9945707, it forms a pair of twin primes.

9945709 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9945707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4972854 + 4972855.

It is an arithmetic number, because the mean of its divisors is an integer number (4972855).

Almost surely, 2^9945709 is an apocalyptic number.

It is an amenable number.

9945709 is a deficient number, since it is larger than the sum of its proper divisors (1).

9945709 is an equidigital number, since it uses as much as digits as its factorization.

9945709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 9945709 is about 3153.6818165440. The cubic root of 9945709 is about 215.0528732411.

The spelling of 9945709 in words is "nine million, nine hundred forty-five thousand, seven hundred nine".